
You need your doctors if you want not to see the other villagers dieing of sickness!
When they are select as "doctors" (the only manner to be sure that they'll heal someone by their own) they will study the plants until they are Adept doctor, then they stop studying by their own and to increase their skills they must heal or you have to make them studying the plants.
It's as they consider that adept doctor is enough for the village's health!

But I have som Master Doctors!
